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arXiv 2109.04032astro-ph.HE
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II型超新星遗迹的暗年龄

Dark Age of Type II Supernova Remnants

Haruo Yasuda, Shiu-Hang Lee, Keiichi Maeda

摘要:

超新星遗迹与超新星爆发机制、祖星和宇宙线加速等都有着密切的联系,是重要的天体。SNRs的非热辐射是探测其周围星周介质结构的有效手段,它可以揭示大质量恒星难以理解的质量损失的机制和历史。在这项工作中,我们计算的时间演变的宽带非热发射SNR起源于II型SNe嵌入在CSM环境中链接的质量损失历史的祖先。我们的研究结果预测,II型信噪比经历了一个长期的弱无线电和$γ$射线发射,如果他们运行到一个空间扩展的泡沫低密度和高温恒星风期间的主要序列。对于一个在平均星际介质(ISM)中演化的典型的红超巨星祖先,这个“黑暗年龄”对应的SNR年龄范围从1000到5000岁。这一结果表明,大多数II型SNRs太微弱而无法被检测到,这可能有助于解释为什么已知的银河系SNRs的数量明显少于我们对银河系SN率的预期。

英文摘要:

Supernova remnants (SNRs) are important objects in terms of their connections with supernova (SN) explosion mechanism(s), progenitor stars, and cosmic-ray acceleration. Non-thermal emission from SNRs is an effective probe of the structure of their surrounding circumstellar media (CSM), which can in turn shed lights on mechanism and history of the elusive mass-loss of massive stars. In this work, we calculate the time evolution of broadband non-thermal emission from SNRs originating from Type II SNe embedded in a CSM environment linked to the mass loss history of the progenitor. Our results predict that Type II SNRs experience a prolonged period of weak radio and $γ$-ray emission if they run into a spatially extended bubble of low density and high temperature created by the stellar wind during main sequence. For a typical red supergiant progenitor evolved within an average interstellar medium (ISM), this "dark age" corresponds to a range of SNR ages spanning from ~1000 to 5000 yrs old. This result suggests that a majority of Type II SNRs are too faint to be detected, which may help explain why the number of known Galactic SNRs is significantly less than what we expect from the SN rate in our Galaxy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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